Derivative Financial instruments and Risk Management- Effect of net settlement provisions upon default or termination- Offsetting liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Offsetting Liabilities
Gross Amount of Recognized Liabilities	$ (137)	$ (71)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(137)	(71)
Financial Instruments	92	34
Cash collateral pledged	0	0
Net Amount of Liabilities	(45)	(37)
Machinery, Energy & Transportation
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(68)	(21)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(68)	(21)
Financial Instruments	55	13
Cash collateral pledged	0	0
Net Amount of Liabilities	(13)	(8)
Financial Products
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(69)	(50)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(69)	(50)
Financial Instruments	37	21
Cash collateral pledged	0	0
Net Amount of Liabilities	$ (32)	$ (29)